In the experiment, students put brine shrimp in water with different concentrati
ID: 87865 • Letter: I
Question
In the experiment, students put brine shrimp in water with different concentration of salt and counted the number.
Which of the following changes to the experiment will increase confidence in the validity of the result?
Count the number of dead brine shrimp instead of living brine shrimp
Add more brine shrimp to the water with the highest salt concentration
Repeat the experiment several times, and calculate the average number of brine shrimp
Reduce the length of the experiment from 24 hours to 8 hours.
Explanation / Answer
Validity is a measure of how accurate an experiment results are. Confidence in the validity of the result can be increased by repeating the experiment several times, and by calculating the average number. Repeating experiments is a standard scientific practice and will determine if the result obtained is accurate. So, the correct option is option C, repeat the experiment several times, and calculate the average number of brine shrimp.